Thermodynamic analysis of a multiple energy production system based on geothermal energy for the production of liquid hydrogen, cooling, hot water and power using a modified organic Rankine cycle using different working fluids

In this research, the thermodynamic analysis of a multiple energy production system based on geothermal energy for producing liquid hydrogen, cooling, hot water, and power using the modified organic Rankine cycle was discussed. The investigated system consists of geothermal subsystems, a modified organic Rankine cycle, a proton exchange membrane electrolyzer, and a liquid hydrogen storage source. Various organic fluids were investigated to increase the system's performance, and finally, the organic fluid R123 was selected. The effect of six design parameters, including the mass flow rate of the inlet to the evaporator, temperature of the inlet to the heat recovery steam generator, turbine efficiency, turbine inlet temperature, evaporator pinch point temperature, and pump efficiency were investigated on the system performance. The results showed that the most effective parameters are the input mass flow rate, the input temperature to the heat recovery steam generator, and the input temperature to the turbine. In this research, the country of Iran was investigated for the implementation of the proposed system, and twelve cities including Isfahan, Dezful, Iranshahr, Kerman, Bojnord, Birjand, Bandar Abbas, Bushehr, Babol, Rasht, Ardabil and Zanjan were selected. Finally, the city of Rasht was chosen because of its good performance in power generation and reasonable cost, and the environmental results showed that the proposed system in Rasht city can help to expand 5 hectares of green space.